trouble with air compressor

[dan28]

does anyone know anything about air comprerssors the other day it worked fine
but today it hums for a second an then blows the fuse its as if the motor is seized

its a magnum 3 hp compressor

 

[Supratada]

Has it been regularly maintained, oiled etc?

 

[ket01]

Compressor

Turn the power off at the mains and or remove the plug from the socket.
Remove the drive belt/s and the belt cover or cage. Get hold of the motor pulley and rotate to check for free rotation. Turn the compressor pulley to check for free rotation. Do they rotate freely?

If it's still not obvious what's wrong, then try running the motor with the belts still off (this is called a motor light run...). If the motor runs OK and the fuse is OK then the problem is more likely to be the compressor (not quite that simple but a good bet).

Check the condition and level of the compressor crank case oil. How often do you need to top it up?

Let me know how you get on.

 

[shovelon]

Mine does the same thing. It is about 20 years old.

But I know the starter is bad. I have to drain the air out for no back-pressure, then it starts and fills. If pressure drops while using within an hour it fills again.